Description
xVictron MultiPlus-II 48/4500/55-32 230V GX Inverter Charger
The Victron MultiPlus-II 48/4500/55-32 230V GX is a combined inverter, battery charger and transfer switch with an integrated GX controller, designed for off-grid, hybrid and backup power installations. It accepts a 48V battery bank, delivers 4500VA of continuous AC output, and includes a built-in Venus OS GX device for monitoring and system control without requiring a separate Cerbo GX or Color Control unit. Suited to professional installers building residential or light commercial energy storage systems.
Key Features
- 4500VA continuous inverter output at 230V AC, with a 9000W peak surge capacity to handle motor start loads.
- 55A battery charger with adaptive charge algorithm, suitable for lead-acid (AGM, gel, flooded) and lithium battery chemistries.
- 32A AC input current limit, adjustable via the GX interface or VEConfigure, allowing fine control over grid or generator input draw.
- Integrated GX controller running Venus OS, providing built-in system monitoring, VRM portal connectivity and DVCC support without additional hardware.
- PowerControl and PowerAssist functions prevent overloading a limited AC source by supplementing grid or generator power with battery power when demand exceeds the input limit.
- Transfer switch with a typical switchover time of 20ms, fast enough to maintain most sensitive loads during a grid outage.
- Single-phase unit; can be configured in parallel for higher power or in split-phase and three-phase systems using multiple units.
- Compatible with Victron VE.Bus communication for integration with MPPT solar charge controllers, BMV battery monitors and other VE.Bus or VE.Can devices.
Product Overview
The MultiPlus-II GX combines the functionality of the standard MultiPlus-II with an onboard GX device, removing the need for a separate Cerbo GX or CCGX in most installations. The Venus OS platform handles system monitoring, data logging to the VRM online portal, and communication between connected Victron devices. This simplifies wiring and reduces hardware costs on straightforward residential or small commercial battery storage projects.
The 55A charger uses Victron's adaptive charging algorithm, which adjusts the charge curve based on battery behaviour rather than applying a fixed profile. This extends battery life across a range of chemistries. The PowerAssist function is particularly useful where the AC input is constrained, such as a small generator or a weak grid connection: the inverter draws the maximum permitted current from the source and supplements any additional load demand from the battery, keeping the generator or supply within its rated capacity.
The 48V battery voltage is the standard choice for systems above 2kW, as it keeps DC cable currents manageable at higher power levels. At 4500VA output, the DC current draw at full load is approximately 100A at 48V, which is practical to wire safely with standard DC cabling. The unit weighs 21.91kg and requires a fixed, ventilated mounting location with appropriate DC fusing and AC isolation in accordance with BS 7671 and any applicable DNO requirements.
Technical Specifications
| Parameter | Value |
| SKU | PMP482406000 |
| Battery Voltage | 48V DC |
| Continuous Output Power | 4500VA |
| AC Output Voltage | 230V AC |
| Battery Charger Output | 55A |
| AC Input Current Limit | 32A |
| AC Input Voltage | 230V AC |
| Phase | Single phase |
| Integrated GX Device | Yes (Venus OS) |
| Transfer Switch Time | Typically 20ms |
| Weight | 21.91 kg |
| GTIN | 8719076066491 |
Applications
- Residential battery storage systems paired with rooftop solar PV, where a single unit handles inversion, charging and system monitoring.
- Off-grid cabins, agricultural buildings or remote sites requiring reliable AC power from a 48V battery bank.
- Backup power installations where fast transfer to battery is required during grid outages.
- Generator-assisted systems where PowerAssist allows a smaller generator to supply loads that exceed its rated output by drawing the balance from the battery.
- Multi-unit parallel installations requiring higher output capacity on a single-phase supply.
What Is Included
- 1x Victron MultiPlus-II 48/4500/55-32 230V GX inverter charger unit
Installation Notes
This unit must be installed by a qualified electrician familiar with battery energy storage systems and compliant with BS 7671 (IET Wiring Regulations). DC connections at 48V with high-capacity battery banks carry significant fault current and require correctly rated fusing, cabling and isolation. For grid-connected installations in the UK, compliance with G98 or G99 (depending on export capacity and DNO requirements) must be confirmed before commissioning. The integrated GX device requires a network connection (Ethernet or Wi-Fi) for VRM portal access. Ensure adequate ventilation around the unit; do not install in an enclosed, unventilated space. Lithium battery integration requires correct DVCC configuration via the GX interface.
Return Policy
xWe offer a 14-day, no-quibble returns or replacement policy because we want you to be totally satisfied with your purchase.
If you are unhappy in any way with your purchase, you can return it for a refund or a replacement, as long as you return it in the same condition as it arrived (original/undamaged packaging and product) and within 30 days of receiving it. We will pay for your return postage on a faulty item as long as you send it using Royal Mail 2nd class recorded delivery (for EU or International Shipments, you have to use our UPS account, we will provide you with a return label)
Please keep in mind the following:
- Items returned within 14 days but not in their original and undamaged packaging will also incur a -15% charge per package.
- If you return an item that doesn't adhere to our returns procedure or doesn't include a returns form, you may be liable for a £10 administration fee
- Individual items from a bundle can't be returned, refunded or exchanged. If you want a refund/credit/exchange for a bundle, all items must be returned to us.
Before you return your item, please make sure that:
- You follow our returns process (outlined below)
- The goods and packaging are undamaged
IMPORTANT: We need to be able to identify an item with your order. We can only do this if you follow our returns process. Please do not send us items back that do not follow this process as they cannot be identified properly and will not be replaced or refunded.
What delivery method do I need to use when returning an item?
You must send the goods back to us via Royal Mail 2nd class recorded delivery. Refunds on faulty items returned are reimbursed within 5 working days.
Can I return just one item from multiple purchases?
Yes. Once you start the returns process you will go to a page that will allow you to choose which items you want to be replaced or refunded.
Returning faulty goods
If your item is faulty, you need to follow the returns policy, where you will be able to state that it’s faulty. The product will then arrive at our warehouse for testing.
If your purchase is not within 14 days
You can still exchange your item for a different product or for credit to use on the Voltacon Solar or Ledison-led-lights.co.uk websites (-15% from the credit amount).
Returns outside of the 14-day period do not qualify for the free returns policy.
Returning an item within the warranty
If you have a warranty and want to return a faulty item, you just need to follow our standard returns process. When we receive your item, we will then check that it’s within warranty and for any faults before arranging a replacement.